pre-commit

#!/bin/sh                                                                                                                                                                                                   
# Copyright 2012 The Go Authors. All rights reserved.
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file.

# git gofmt pre-commit hook
#
# To use, store as .git/hooks/pre-commit inside your repository and make sure
# it has execute permissions.
#
# This script does not handle file names that contain spaces.

#authors_cmd="git log --format='%aN <%aE>' | sort -f | uniq | grep -v '<hajimehoshi@hajimehoshi.com>'"
#authors=$(eval "$authors_cmd")
#authors_diff=$(echo "$authors" | diff AUTHORS -)
#if [ -n "$authors_diff" ]; then
#    echo >&2 "AUTHORS should be updated."
#    echo >&2 "Command:"
#    echo >&2 "  $authors_cmd > AUTHORS"
#    echo >&2 ""
#    echo >&2 "Diff:"
#    echo >&2 "$authors_diff"
#    exit 0
#fi

clang_format_diff=$(git clang-format --diff -q)
if [ "$clang_format_diff" != 'no modified files to format' ] &&
   [ "$clang_format_diff" != 'clang-format did not modify any files' ] &&
   [ "$clang_format_diff" != '' ]; then
    echo >&2 "clang-format must be done."
    echo >&2 "Command:"
    echo >&2 "  git clang-format"
    echo >&2 "" 
    echo >&2 "Diff:"
    echo >&2 "$clang_format_diff"
    exit 1
fi

gofiles=$(git diff --cached --name-only --diff-filter=ACM | grep '\.go$')
[ -z "$gofiles" ] && exit 0

unformatted=$(gofmt -s -w -l $gofiles)
[ -z "$unformatted" ] && exit 0

# Some files are not gofmt'd. Print message and fail.                                                                 
echo >&2 "Go files must be formatted with gofmt. Please run:"
for fn in $unformatted; do
    echo >&2 "  gofmt -s -w $PWD/$fn"
done

exit 1